Mounting Mulitple Drives at Boot Time using LUKS (dm-crypt)
Mounting more than just the root partition at boot using LUKS/dm-crypt is a little more complicating than setting up just the one. Rather than just placing your UUID of the root partition in the /etc/default/grub file you have to go through several more steps. Follow along as I describe a simple way to get more than one partitions/disks mounted at boot time.
When you might not want mount-encrypted drives at boot.
Having encryption at rest built into a partition/disk is a great way to keep those who have physically compromised said disk out from reading your data easily.